// utils/uuid.js
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export function generateUUIDv4() {
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// 优先使用 crypto（更安全），MiniProgram / H5 / Node 环境可能都支持
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if (typeof crypto !== 'undefined' && crypto.getRandomValues) {
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const buf = new Uint8Array(16);
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crypto.getRandomValues(buf);
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// Per RFC4122 v4
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buf[6] = (buf[6] & 0x0f) | 0x40;
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buf[8] = (buf[8] & 0x3f) | 0x80;
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const hex = Array.from(buf).map(b => b.toString(16).padStart(2, '0')).join('');
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return `${hex.substr(0,8)}-${hex.substr(8,4)}-${hex.substr(12,4)}-${hex.substr(16,4)}-${hex.substr(20,12)}`;
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} else {
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// 备用（兼容性）：Math.random 实现（伪随机，注意安全性）
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let d = new Date().getTime();
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if (typeof performance !== 'undefined' && typeof performance.now === 'function'){
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d += performance.now(); // 更好的熵
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}
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return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, c => {
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const r = (d + Math.random()*16) % 16 | 0;
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d = Math.floor(d/16);
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return (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16);
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});
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}
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}
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